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# Environment Variables
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To use Nix, some environment variables should be set. In particular,
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`PATH` should contain the directories `prefix/bin` and
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`~/.nix-profile/bin`. The first directory contains the Nix tools
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themselves, while `~/.nix-profile` is a symbolic link to the current
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*user environment* (an automatically generated package consisting of
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symlinks to installed packages). The simplest way to set the required
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environment variables is to include the file
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`prefix/etc/profile.d/nix.sh` in your `~/.profile` (or similar), like
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this:
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source prefix/etc/profile.d/nix.sh
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2020-07-23 08:44:54 +00:00
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# `NIX_SSL_CERT_FILE`
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If you need to specify a custom certificate bundle to account for an
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HTTPS-intercepting man in the middle proxy, you must specify the path to
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the certificate bundle in the environment variable `NIX_SSL_CERT_FILE`.
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2020-07-23 08:44:54 +00:00
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If you don't specify a `NIX_SSL_CERT_FILE` manually, Nix will install
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and use its own certificate bundle.
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Set the environment variable and install Nix
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$ export NIX_SSL_CERT_FILE=/etc/ssl/my-certificate-bundle.crt
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$ sh <(curl -L https://nixos.org/nix/install)
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In the shell profile and rc files (for example, `/etc/bashrc`,
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`/etc/zshrc`), add the following line:
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export NIX_SSL_CERT_FILE=/etc/ssl/my-certificate-bundle.crt
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> **Note**
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>
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> You must not add the export and then do the install, as the Nix
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> installer will detect the presense of Nix configuration, and abort.
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2020-07-23 08:44:54 +00:00
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## `NIX_SSL_CERT_FILE` with macOS and the Nix daemon
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On macOS you must specify the environment variable for the Nix daemon
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service, then restart it:
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$ sudo launchctl setenv NIX_SSL_CERT_FILE /etc/ssl/my-certificate-bundle.crt
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$ sudo launchctl kickstart -k system/org.nixos.nix-daemon
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## Proxy Environment Variables
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The Nix installer has special handling for these proxy-related
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environment variables: `http_proxy`, `https_proxy`, `ftp_proxy`,
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`no_proxy`, `HTTP_PROXY`, `HTTPS_PROXY`, `FTP_PROXY`, `NO_PROXY`.
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If any of these variables are set when running the Nix installer, then
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the installer will create an override file at
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`/etc/systemd/system/nix-daemon.service.d/override.conf` so `nix-daemon`
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will use them.
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